/Engine/Source/Runtime/Engine/Public/AnimationRuntime.h
Lerp for BoneTransforms. Stores results in A. Performs A = Lerp(A, B, Alpha);
static void LerpBoneTransforms ( [TArray](API\Runtime\Core\Containers\TArray)< FTransform > & A, const [TArray](API\Runtime\Core\Containers\TArray)< FTransform > & B, float Alpha, const [TArray](API\Runtime\Core\Containers\TArray)< FBoneIndexType > & RequiredBonesArray )